BTVN - Phương trình lượng giác (Tiết 1) - Có lời g...

A \(\left\{ {\frac{\pi }{4} + k\pi \left| {k \in \mathbb{Z}} \right.} \right\}.\)

B \(\emptyset .\)

C \(\left\{ {k\frac{\pi }{2}\left| {k \in \mathbb{Z}} \right.} \right\}.\)

D \(\left\{ {\frac{\pi }{4} + k2\pi \left| {k \in \mathbb{Z}} \right.} \right\}.\)

A \(A \ne 0,\alpha  = k\pi ,k \in \mathbb{Z}.\)

B \(A \ne 0,\alpha  = \frac{\pi }{2} + k\pi ,k \in \mathbb{Z}.\)

C \(A \ne 0,\alpha  = \frac{{k\pi }}{2},k \in \mathbb{Z}.\)

D \(A \ne 0,\alpha  = \frac{{k\pi }}{4},k \in \mathbb{Z}.\)

A \(T = 4\pi .\)     

B \(T = 3\pi .\)

C \(T = \pi .\)

D \(T = 2\pi .\)

A \(T = \pi .\)

B \(T = 4\pi .\)

C \(T = \frac{\pi }{4}.\)

D \(T = 7\pi .\)

A \(y = 3 - 2\sin x.\)

B \(y = 6 - \sin x.\)

C \(y = {\sin ^2}x.\)        

D \(y = 2 - 2{\sin ^2}x.\)

A \(x = \frac{\pi }{3} + k\pi ,x = \frac{{2\pi }}{3} + k\pi ,k \in \mathbb{Z}.\)            

B \(x = \frac{\pi }{3} + k2\pi ,x = \frac{{2\pi }}{3} + k2\pi ,k \in \mathbb{Z}.\)

C \(x = \frac{\pi }{6} + k\pi ,x = \frac{{2\pi }}{6} + k\pi ,k \in \mathbb{Z}.\)

D \(x = \frac{\pi }{6} + k2\pi ,x = \frac{{2\pi }}{6} + k2\pi ,k \in \mathbb{Z}.\)

A \(76\pi .\)          

B \(74\pi .\)          

C \(73\pi .\)          

D \(75\pi .\)          

A \(D = \left\{ {k\pi |k \in \mathbb{Z}} \right\}\)

B \(D = \left\{ {\frac{{k\pi }}{2}|k \in \mathbb{Z}} \right\}\)

C \(D = \left\{ {\frac{{k\pi }}{4}|k \in \mathbb{Z}} \right\}\)

D \(D = \left\{ {k2\pi |k \in \mathbb{Z}} \right\}\)

A \(x = \pi  + k2\pi, k \in \mathbb{Z} \)

B \(x = \pi  + k\pi, k \in \mathbb{Z}  \)

C \(x = \frac{\pi }{2} + k2\pi, k \in \mathbb{Z}  \)

D Vô nghiệm